16
25VNA EVENT / FAULT (CONT.)
OPERATION
FLASH CODE
(Amber LED)
Heat or Cool
Mode
Possible Causes ACTION
Event 72 Cool High Suction Gas Temperature
System will try to ride through current
spikes and self---recover in trip condition;
persistent over current trips will lead to
Error82”SuctionOverTempLockout”
(Refer to Error 82 troubleshooting)
Event 75 Both
Outdoor Airflow too low or off
Check ODU coil for clogging (ice or
debris) and clean if necessary;
Trou bleshoot ODU fan motor and make
sure it is working
Blocked Inverter Heat Exchanger
(fins)
Check Inverter fins for debris and clean if
necessary
Application violates guideline
Consult Application Guideline for compli-
ance
Event 77 Both
High Current Spikes in current
measured by the Inverter drive
System will try to ride through current
spikes and self---recover in trip condition;
persistent over current trips will lead to
Error 95 ”High Current Lockout” (Refer
to Error 95 troubleshooting)
Event 79 Both
Inverter Output to Compressor
leads miswired leading to com-
pressor running backwards
check wiring at Inverter outputs
Inverter Output to Compressor
leads not attached
check wiring at Inverter outputs
Reversing Valve Bypass
Reversing Valve Stuck halfway;
troubleshoot reversing valve
Compressor Winding damage
T roubleshoot compressor windings. For
the 2 and 3T the resistance should be
.681 ohm and for 4 and 5T the resist-
ance should be .203 ohm at 70F
+/ ---20F. See compressor troubleshoot-
ing guidelines. If confirmed replace
compressor
System Malfunction 82 Cool
Overcharge, Attic run lineset and
High Load conditions
Verify charge by putting in cooling char-
ging mode
Outside Normal Operating Range
(e.g.improperloadcalculation,sys-
tem match issue, outside cooling
range etc)
Consult Application Guidelines
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